Feed-grinding machine



Nov. 24, 925. f 1,562 562 A. E. JACQBSON FEED GRINDING MACHINE FiledApril -21, 1923 I/VVE/V T017.

Nov. 24, 1925. 1,562,562

- A. E. JACOBSON I FEED GRINDI-NG MACHINE Filed Aprii 21, 1923 2Sheets-Sheet 2 n l' N W I v 5) /7 Tram/2.

Patented Nov. 24, 1925.

nxnr. n. JAGOBSON, or MAINNEAPOLIS, MINNESOTA.

PATENT OFFICE.

FEED-GRINDING MACHINE.

, Application ,fil'ed April 21, 1923. Serial No. 633,782.

To all whom it may concern:

Be it known that I, AXEL E. JACOBSON, a citizen of the United States,residing at Minneapolis, in the county of Hennepin and State ofMinnesota, have invented certain new and useful Improvements in F eed-Grinding Machines; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame. i

This invention relates to a grinding machine, and particularly to such amachine adapted to grindgrain, feed, and the like.

The present invention is an improvementupon the machine disclosed in myprior Patent No. 1,374,207, granted April 12, 1921.

It is an object of the present invention to providesuch a grindingmachine having improved means for delivering the material thereto andforming a compact and enclosed structure.

Itis a further'object of the invention to provide a convenient andeasily removable and renewable form of grinding surfaces and members inthe machine.

It is also an object of the invention to provide a positively drivenfeeding means for the grinding machine and simple and efficient meansfor operating the same from the main shaft of the machine.

These and other objects and advantages of the invention will be fullyset forth in the following description made in connection with theaccompanying drawings in which like reference characters referto thesame parts throughout the different views, and in which,

Fig. 1 is a view 'n side elevation of the machine, certain p rts thereofbeing shown in section;

I l v a Fig. 2 1s a viewin end elevation of the machine as seen from theright of Fig. 1, a

portion of themachine being shown in section;

Fig. 3 is a view in end elevation of the machine as seen from the leftof Fig. 1;

Fig. 4 is a view in vertical sectionof the grinding machine, saidsection being taken substantially on the'line 44 of Fig.1, as indicatedby the arrows;

Fig. 5 is a view in vertical section on the line 5 5 of Fig. 4;

Fig. 6 is a view in end elevation of one of the groups of grindingblades used;

Fig. 7 is a vertical section taken on the line Z-7 of Fig. 6;\-and 'Fig.8 is a view in end elevation of a locking means for one base of themachine and provided with lugs I 2 adapted to receive foundation orsecuring bolts.- The member 1 extends a con: siderable distance at oneend and has a cap bearinjg 3 at said end forming one of the bearings orthe main shaft 4 which is also journaled in a bearing 5. The end of themember l-opposite the bearing 3 has side portions 6 connected by endwalls 7 formed with semi-circular openings 8. I A pair of spaced rings 9are fitted in said openings and secured to the end walls 7. A disk 10having a central opening 11 is secured to the outer ring 9, as shown inFig 8, and a disk 12 having a central opening substantially fitting theshaft 4 is secured to the inner ring 9, said rings being suitablyrecessed to receive said disks andsaid disks having inwardly directedcircular flanges 13 fitting the inner sides of said- I rings. The walls6 each have an inwardly directed straight flange 14 projectingtherefrom, which flanges are apertured to receive the threaded ends ofspaced semi-circular rods 15 extending downwardly in the memedgesdisposed somewhat above the horizontal diameter of rings 9, at theexterior of the lower beveled edges of arcuate upper cover plates 19bolted to the rings 9. Plates A or bars 17 are provided having flangedportions extending over the top .of the walls 6, said bars abuttingagainst the top margins of the screen 16and'being moved by the screws 18to press the upper portion of said screen firmly against the plates 19..The

bolts 18, as clearly shown in Fig. 4, are threaded through the walls 6.The arcuate spider hubs 25 and 26.

plates 19 extend between and over the rings 9 at each side of said ringsand hold in place grinding plates 20 disposed between the same and therings 9,. bolts 21 extending through'both sets of plates 2 and 19. A topsection or plate 22 extends between the upper sides of the plates 1 andholds in place spaced grinding bars 23 seated in slots therein andagainst rings 9 and engaged by screws 24 extending through the top ofplate 22. The plate 22 is also held in place by cap screws extend; ingtherethrough and intothe rings 9. The shaft 4, as shown in F ig 5,terminates ad jacent the plate '10 and said shaft has secured thereto,between the disks 10 and 12, These hubs have radially projectingcircumferentially spaced lugs and spaced disks 27 are riveted or boltedto said hubs by bolts or rivets 28 extending through the said lugs. Saidspider hubs are made of different sizes as shown in Fig. 4 and oneadjacent pair of the disks 27 are riveted to one hub and the through thelugs of the other hub. Circumferentially spaced shafts 29 illustrated asfour in number, extend between and through the disks 27 having the endportions projecting beyond the outer disks 27, sai portions havingtransverse slots formed therein adjacent the disks adapted to receivethe segmental swinging plates 30 pivotally connected. to the outside ofthe outer disks. The shafts 29 carry between each pair of adjacent disksthe headed bushings 31 having pivotally mounted thereon s acedsubstantially rectangular plates 32 avin spaced washers 33therebetween.It. Wille noted that the ends of the plates 32 are formed on the arcs ofcircles. Plate 10 has a section 10 formed as a hinged door supported onElie hinge bolts '10, as clearly shown in ig. 3. a

An upwardly extending housing 34 substantially rectangular in horizontalcross section, is bolted to the disk 10 and extends over the opening 11therein, the inner wall of said housing being provided with spaced lugs35 through which the attached bolts to plate 10 extend. The bottom 36vof the housjusted position by a tightening bolt, not

ing 24 inclines downwardly and inwardly and is provided with spaced ears37. pivoted by headed and nutted bolts'to spaced ears 38 on the outerwall of the housing 34, so asto be hingedly connected and adapted'to be.swung when desired, to open position, as,

illustrated by dotted lines in Fig. 1. A rod 39 extends transversely ofthe housing 34 adjacentthe rear wall thereof and aplate 40 is pivotallyconnected to said rod and adaptedto be moved to various positions insaidhousing, the same-being held 1n adshown, extending through an arcuateslot in the plate 40 secured to the side of the housing. Said housing 34has a flaring hopper at its upper end communicating with and'bolted toan inclined section or chute 41, a portion of the upper wall of which ishinged on a transversely extending rod 42, so as to be raised, whendesired, as indicated by the dotted line position in Fig. 1. The chute41ha's an upstanding baffle 43 extend ing thereacross which issubstantially perpendicular to its top and bottom walls and an opening44 is formed in the bottom of said chute immediately above and adjacentsaid bafile. The chute is connected to and communicates with, at itsupper end, a

trough 45 having a semi-cylindrical bottom.

in which is disposed a screw conv'eyer 46. Trough 45 and the partscarried thereby are supported by vertical struts 45 secured to the sidesoft-he trough at their upper ends and bolted at their lower ends to thehousing 1. Said trough 45 has a cover 47 and a hopper 48 extendingthereabove at one end and communicating therewith. The conveyor 46 issecured to a shaft 49 extending longitudinally through the trough 45 andjournaled in the ends thereof, one of which ends has a pair of members50 secured thereto having arms projecting in substantially oppositedirections to the ends of which are pivotally connected the inner endsof links 51. Said links are formed with right angle turns at their outerends and are pivotally connected to a crank pin 52 projecting from acrank disk 53 secured to a shaft 54 journaled in bearings 55 projectingfrom one side of the trough 45. driven by a sprocket 56 journaledthereon having a sleeve provided with notches 57 adapted ,to engage withr projections 58 formed on a sleeve 59 which is pinned or The shaft 54is,

otherwise'secured to the shaft 54. A spring 60 is disposed about shaft54 between the sleeves 59 and the sprocket 56 and normally holds saidmembers disengaged. The sprocket sleeve is engaged by a sleeve 61 alsojournaled on shaft 54 and having one end formed as a cam adapted tocooperate with a cam surfaceon the end of one of the bearings 55whereby, when the sleeve 61 is swung by its handle 62, the sprocket 56 ywill vbe moved into engagement with the sleeve 59 and the shaft 54 willbe driven.

When said shaft is driven. the shaft 49 is intermittently rotated as isalso the conveyor 46. The sprocket 56 id driv n b a chain 63 runningover and, in turn, driven by a sprocket 64 carried by shaft 65. Theshaft 65 is journaled in bearings formedo-n the gear box 66 and carriesa gear meshing with and driven by a gear on a shaft 67 also journaled inbearings on the gearbox 66, said gears being disposed in said box andnot shown. The shaft 67 is provided with a pulley 68 driven by a belt 69from a small pulley on a shaft 4. The gearbox 66 is supported on abracket bolted to one side nected with any suitable source of power.-The plates 32 will be thrown outwardly by centrifugal force and willmove in close.

proximity to the grinding plates 21 and the grinding members 23. Thesides of plates 32 will also act as a fan and will produce a powerfulsuction through the opening 11 which forms the eye of the fan. Thematerial to be ground will be placed in the hopper 48 and, as the shaft49 is driven through the shaft 54, material will be fed by the conveyor46 into the chute 41. .The material will pass down along the bottom ofthis chute and against the bafiie plate 43. The air drawn in by the fanwill enter chute 41 through the opening .as indicated by the dottedarrow in Fig. 1. This blast of air is sulficiently strong to lift thegrain and other material to be ground over the baffles 43 so that thesame will drop into housing 34. If foreign material, however, such asstones, iron, nuts or bolts, etc., will drop through the opening 44 andwill not be so lifted by the air. The force of the current of airentering the chute 41 may be regulatedby adjusting the swinging plate40. The material dropping down into housing 34 is directed into the eye11 of the grinding chamber and is thrown out against the grindingsurface by the plates 32 and ground as desired. The air blast created bythe. rotating grinding members and fan passes out through the lowerscreen section 15 and the ground material is carried through this screenby the blast and also by the action of the plate 32 and is dischargedthrough the bottom of the housing 1.

The screen section 15 is firmly held in po-' sition by the rods 15 whichcan be maintained in tight relation thereto by adjust L I ,ment of thenuts at the ends of said rods.

Said screen is also held tightly in place by the bars 17. If it isdesired to remove the screen, one of the bars 17 can be removed. Thescreen can then-be removed by rotating the same and sliding it sidewaysor circumferentially out through the opening formed by the removed bar.The sections 19 and 23 and the grinding plates carried thereby are alsoreadily removable so that new griding plates can be very easily.substituted. The shaft 29 can also readily be removed by merely turningthe locking plates-or lugs 30 out of the slots therein.

Access, may also readily be had to the interior of the grinding chamberthrough the door 10 and the bushings 31 carrying the plates 32 can beremoved for any purpose by being brought into alinement with this doorand removing the shafts 29. Access may also readily be had to the chute41 by the pivoted cover formed thereon. Access may also easily be had tothe housing 34 by the pivoted bottom 36' thereof. The grinding plateshave double-ended grinding projections thereon so that the rotation ofthe grinding head may be reversed and shaft 4 driven in eitherdirection. The grinding surfaces may be like those disclosed inapplicants prior Patent No. 1,374,207 granted April 12-, 1921.

From the above description it is seen that applicant has provided acompact and efli cient grinding mill, all the necessary parts of whichmay readily be removed for substitution or repair and which mill isconveniently accessible at all necessary points. The machine is verycompact and'the parts thereof are easily constructed and assembled. Themachine is being manufactured and marketed and has proven very efficientin actual practice for the purposes had in view.

It will, of course, be understood, that. Va v rious changes may be madein the form, de-

tails, arrangement and proportions of the parts without departing fromthe scope of applicants invention, which, generallystated, consists in adevice capable of carrying out the objects above enumerated, such asshown and described and set forth in the appended claims.

What is claimed is:

1. A grinding machine having in combination, a casing, a grindingsurface secured therein, a rotary grlnding memberdisposed in said casingand co-operating with saidsurface and constituting a fan, said casinghaving an axial lateral openin forming the eye of said fan, an upward yextending housing communicating with said eye, and

an' inclined chute to which the material to be ground is delivered, abaffle plate extending upwardly across the major part of said chute,said chute having an opening in its lower side immediately above andadjacent said baflie plate through which air is drawn by said fan tolift the material delivered to said chute over. said baffle plate andthrough -cir'cular recesses formed therein, spaced rings fitting in andsecured in said recesses,

said side walls having inwardly extending flanges projecting therefrom,longitudinaladjustable curved members having their ends secured in saidflanges, a semi-circular screen supported by said members, and aplurality of top sections removably secured to said rings and forming asemi-circular top above said housing.

- 4. The structure set forth in claim 3, lat-' orally adjustable bars atthe sides of said base by which the upper edges of said semicircularscreen are held in position, said screen being removable when one ofsaid bars is removed by a slidable circumferential movement.

5. A grinding machine having in combination, a housing comprising spacedbearings and a casing having side and end walls at one end of saidbearings and extending through one end wall and terminating adjacent theother, the latter having an opening through which material is fed aroundsaid shaft, a rotary shaft journaled in said bearings, a grinding membersecured to said, shaft, said side walls having flanges extendinginwardly therefrom semi-circular curved spaced rods extending downwardlybetween said flanges and having their threaded and nutted ends extendingthrough said flanges, spaced rings secured in the sides of said endwalls, a semi-circular screen supported-on said rods, bars secured ateach side of said housing at the top there of, means for moving saidbars inwardly, to clamp the top portions of said screens, a plurality ofremovable arcuate sections forming a semi-cylindrical top for said.housing secured to said rings, and a plurali ty of grinding plates'heldin place by said removable sections.

6. A grinding machine having in combination, a housing having end walls,one of, which has an axial opening therethrough,

' ashaft extending axially through the other end wall and terminatingadjacent said opening, a rotating grinding member secured to said shaft,a pair of spaced rings secured in the sides of 'said housing, aremovable semi-circyf ar screen formingthe lower half of a grindingcasing surrounding said grinding member, means for holding said screenagainst said rings and removable top and sidesections forming asemicylindrical upper half of the grinding cas ing, said sections beingsecured to said rings and securing inplace a plurality of members havinggrinding surfaces thereon in the upper half of said grinding casing.

7. A grinding machine comprising a casing, a rotary grinding memberthere n comprising a shaft, spaced disks secured thereto,

a plurality of circumferentially spaced shafts extending between andthrough said disks, headed bushings on said last mentioned shaftsbetween each air of adjacent disks, spaced bladesrevolubly mounted onsaid bushings, spaced washers between said blades, said last mentionedshafts projecting beyond the outer disks and movable lockin means onsaid outer disks engaging sair shafts to hold the same in endwlseposition, said locking members being movable to permit endwise removalof said shafts.

' 8. A grinding machine having in combination, a substantiallycylindrical grinding casing having abrading means on its innerperipheral wall, a grinding head in said casing comprising radiallyswinging heaters co-operating therewith, a shaft carrying said head andextending axially into said casing at one side thereof, the other sidevof said casing having a central opening therethrough, a feed chute atthe last mentioned sides of said opening, said chute having a membertherein over which the material must be lifted, said grinding headacting as a fan to lift the material over said member and drawing saidmaterial and air into said central'opening.

9. A grinding machine having in combination, a casing, a grindingsurface secured therein, a rotary grinding member disposed in saidcasing and co-operating with said surface and constituting a fan, saidcasing having axial lateral opening \forming the eye of said fan, achute extending partially across the same leading to said eye, a bafliein said chute, said chute having an opening in the bottom thereofadjacent said baflie, said fan being adapted to draw air through saidopening to lift the material to be ground over said bafiie, and meansfor regulating the air drawn through said opening.

10. A grinding machine having in" combination, a substantiallycylindrical grinding casing having abradin' means on. its upper interiorportion, an a. screen wall .at its lower portion, said casing having aclosed side, a shaft projecting axially through-the closed 'side of saidcasing, feeding means including a ,bafile over which material must beliftedto pass into said ma terial opening, a head secured to said shaftand rotatable therewith adapted to c0-operate with said casing andfeeding means, said head acting as a fan to lift the material over saidbattle and to draw said material and air through said centralopening,.said casing. having a discharge passage below said screen'wallthrough which the ground material'and air is discharged 11. Agrinding element for a grinding machine comprisinga shaft, a headedbushing journaled on said shaft, s aced blades revolubly mounted on saidushing and \s paced washers between said blades, fsaidbushing and thebladesand' washers carried thereby being removable as a unit from saidshaft.

,12. In a grinding machine, a grinding head comprising spaced disks, alongitudinally removable shaft extending between said disks, movablemeans holding said shaft in place, a bushing on said shaft, beaterblades journaled on said bushing, spacing means on said bushingbetweensaid blades, said bushing having means at its end for holding saidblades thereon whereby said shaft may be removed'and said bushing,blades and spacing members can be removed from said shaft as a unit.

13. A-grinding machine comprising a casing, a rotary grinding membertherein comprising a shaft, spaced disks secured thereto, a plurality ofcircumferentially spaced shafts extending between and through saiddisks, bushings on said last mentioned shafts between each pair ofadjacent disks, beaters revolubly mounted on said bushing, said bushingshaving means holding said beaters thereon, spacing means between saidheaters,

and movable locking means for holding' said last mentioned shaftinposition in said disks whereby said shaft can be removed endwise andsaid bushings and heaters removed as a unit.

14. A grinding machine having in combination, a housing comprisingspaced bearings, and a casing having side and end walls,

said side walls having rings about the outer edges of their inner sides,a rotary shaft journaled in said bearings, a grinding member secured tosaid shaft, said side walls having flanges extending inwardly therefrom,semi-cylindrical curved spaced rods extending downwardly between saidflanges and having threaded and nutted ends ex tending through saidflanges, a semi-circular screen supported on said rods, and means at thesides of said casing movable against the screen to press the sameagainst said casing for holding the same'in place, said screen beingremovable by a circular sliding movement when said latter means aremoved outwardly. j

I 15. A griildin machine havin in combination, a cylin rical casinghavlng a verptical side wall with an opening thereinto, a chute leadingdownwardly directly to said opening having an inclined portion, saidportion having an opening in the bottom thereof, a baflie below saidopening extending upwardly toward the top of said chute, a rotary headin said casing constituting a fan and acting to draw air through saidopening in said chute and air and material into said casing whereby thematerial to be ground will be carried up over said baflle and any heavyforeign articles will fall through said opening and chute 16. A grindingmachine having in combination, a housing comprising spaced bearings, acasing having side and end walls, a rotary shaft journaled in saidbearings, a grinding member secured to said shaft,

spaced semi-circular means disposed at the

